Taxonomy & naming
Before it had a formal name, this fish circulated in the hobby as Metriaclima sp. 'zebra slim' or 'compact zebra Mbamba Bay' — names that capture both its elongate form and its provenance near Tanzania's Mbamba Bay. Ad Konings and Jay Stauffer had observed and photographed it for years before Stauffer, K. Black, and Konings formally described it in 2013 as Metriaclima tarakiki in Zootaxa 3647, a paper that simultaneously re-diagnosed the genus type species Maylandia zebra and described four other new species from the lake. The holotype is PSU 4914, an adult male 4.5 in standard length collected at Higga Reef, Tanzania, on 13 February 2005; paratypes were taken from Higga Reef and Ngkuyo Island.
The genus name under which it now appears in most databases — Maylandia — is itself contested. Meyer and Foerster proposed Maylandia as a subgenus in 1984, but Stauffer and colleagues declared it a nomen nudum in 1997 (lacking the differentiating characters required by ICZN Article 13) and introduced Metriaclima instead. In 2025 the ETYFish Project's Christopher Scharpf argued in Zootaxa that Maylandia is validly described and that Metriaclima is its junior synonym; days into 2026, Konings, Geerts and Stauffer replied in Taxonomy that Maylandia remains a nomen nudum and that they will continue using Metriaclima. Eschmeyer's Catalog of Fishes and FishBase presently accept Maylandia as the current name, which is why this site uses it — but the debate is live, and depending on how the community settles the question, the valid genus for this fish may revert to Metriaclima.
Morphology
The most diagnostic field character of Maylandia tarakiki is what the name promises: a shallower, more elongate body than other members of the zebra complex. Morphometric data from the original description show the distance between the dorsal-fin origin and pelvic-fin base averages about 28.8% of standard length in this species, compared with 34.2–40.7% in Maylandia zebra populations from the same Tanzanian coastline — a real and measurable difference that is immediately visible to a practised eye. The dorsal-fin formula runs XVII–XIX spines and 8–10 soft rays; the anal fin has III spines and 8–9 rays. On the lower jaw, tooth rows number 5–8, more than the 3–5 typical of Maylandia zebra.
Breeding males are blue to blue-white on the flanks, crossed by 7–9 clear black lateral bars that extend up onto the dorsal fin but, crucially, do not fuse into a broad dark submarginal band — the feature that distinguishes this species from Maylandia zebra and Maylandia fainzilberi, whose lateral extensions do coalesce. The anal fin is blue; the pelvic fins are black with a white leading edge. Females are either plain light brown with blue-centred flank scales and a dark opercular spot, or orange blotch (OB), meaning a yellow-to-orange base sprinkled with irregular black blotches across the body, head, and fins. OB females are far more common in the aquarium trade than brown females; OB males, sometimes called 'blueberry zebras' for their blue ground colour showing through the blotching, also occur in both known populations. Standard length in the description runs from 3 in for the smallest paratype to 4.5 in for the largest, equating to roughly 3.5–6 in total length in the field. FishBase gives a maximum of 4.5 in SL; malawi.si reports wild males reach about 5.5 in total length, females about 1 in shorter, while aquarium specimens can approach 7 in total length under good care.
Habitat
Maylandia tarakiki is a Lake Malawi endemic with one of the tighter distributions in its genus, known from three localities along a stretch of Tanzanian shoreline totalling roughly seven kilometres: Higga Reef (the type locality), Ngkuyo Island, and the rocky shore immediately south of Mbamba Bay known as Chuwa. All three sites are on the eastern shore of the lake, in Tanzanian national waters. The IUCN estimates the total area of occupancy at fewer than 6 mi².
Within those sites the fish is strictly bound to large-boulder rocky habitat — usually submerged boulders free of silt where wave action or depth keeps sediment from settling. It is rarely found on scattered rocks surrounded by sand or in areas with heavy sedimentation. Higga Reef itself consists of large submerged boulders; at the end of the rainy season in 1993 the reef was completely submerged, though declining water levels had exposed the tallest boulder by 2004 (Konings, pers. obs.). Like all Malawi mbuna, this species is a shallow-water fish, inhabiting the upper rocky zone where light penetrates well and aufwuchs grows thickly, with the IUCN noting it is also found at somewhat deeper levels.
Lake Malawi's water chemistry is stable and alkaline across its rocky littoral zone. Water parameters typical of this habitat: pH approximately 7.7–8.6, temperature 75–82 °F, and moderate hardness — values that have been consistent across multiple long-term monitoring studies of the lake's surface waters.
Feeding
Like all Metriaclima-group mbuna, Maylandia tarakiki is an aufwuchs grazer. It harvests loose material from the algal matrix coating the boulder surfaces — primarily diatoms and short filamentous algae including cyanobacteria — by combing the substrate with its tightly packed rows of bicuspid and tricuspid teeth. The inner tooth rows average more on the lower jaw (5–8 rows) than in Maylandia zebra (3–5), possibly related to the more vigorous or frequent grazing that keeps these narrow-bodied fish fuelled on what is essentially a low-calorie diet.
The species occasionally supplements its aufwuchs diet with plankton. Observers at Higga Reef have noted schools of Maylandia tarakiki forming in the water column when planktonic organisms are abundant near the reef surface, a behaviour recorded in several mbuna and thought to be an opportunistic response to transient food pulses. Outside those foraging episodes the fish stays close to the rocks.
Mating
Maylandia tarakiki is polygynous. Males hold territories centred on a cave or crevice within the boulder field, defending them against rival males — territories often abut one another with as little as one metre between neighbouring males in breeding condition. Females move more freely, typically foraging in loose groups; they may also be found singly. When ripe, a female approaches a territory, the male displays his full breeding colouration, and spawning takes place inside the male's cave.
The species exhibits polychromatism: OB females and OB males are present at both known populations, with the OB trait apparently heritable through both sexes — a keeper who bred the species noted that OB males produce both OB and normally barred (BB) male offspring, and vice versa. In the aquarium trade this genetic diversity, combined with the visual appeal of the orange-blotched morphs, made the fish popular among experienced hobbyists well before its formal description.
Breeding
Females are maternal mouthbrooders. After spawning inside the male's cave, the female collects and broods the eggs alone. During incubation she withdraws into the rocks and feeds little, which is typical of mouthbrooding mbuna. Clutch size is not formally documented in the literature for this species; based on body size and comparison with congeners of similar dimensions, broods of 15–30 fry per cycle are plausible, but this remains an estimate rather than a verified figure. [NOTE: clutch size not published for this species; figure above is habitat-typical inference only.]
In the aquarium the species has been kept and bred since at least the early 2000s, when it was imported via Old World Exotic Fish in Florida under the trade name 'zebra slim.' Experienced keepers report that it behaves like other small-to-medium mbuna: a male kept with three or more females in a suitably rocky tank of at least 80 US gal will spawn readily once established, but surplus males must be removed — male-on-male and male-on-female aggression is intense. Females commonly hold fry for 21–28 days at typical mbuna temperatures before releasing free-swimming juveniles.
In the aquarium
Maylandia tarakiki is not commonly stocked by general pet shops — it circulates mainly through specialist mbuna importers and hobbyist networks, often still sold under trade names like 'zebra slim' or 'slim Mbamba Bay.' Keepers who have tracked down correctly identified specimens describe it as a rewarding but demanding fish that requires the same baseline conditions as any Lake Malawi mbuna: a tank of at least 80 US gal for a single-species group, decorated heavily with stacked limestone or sandstone rocks that create numerous caves and sight-breaks. A bare or sparsely decorated aquarium will produce chronic aggression that no stocking formula can fix. Sand substrate — coarse lake sand or inert play sand — is appropriate; the fish grazes the rockwork rather than the bottom, so deep substrate is unnecessary.
Water chemistry must reflect the lake's stable alkaline profile: pH 7.8–8.6, temperature 75–82 °F, and moderate to hard water. These values align directly with the wild-habitat data in this species' facts. Sudden pH drops — caused by insufficient buffering, heavy organic waste, or an undersized filter — are a primary trigger for Malawi bloat, a virulent internal bacterial condition (frequently Aeromonas or Pseudomonas infection exacerbated by immunosuppression) that can kill a fish within 48–72 hours. Robust biological filtration, a low organic load, and regular water changes of 20–30% weekly are not optional extras; they are the minimum maintenance standard. Carbonate hardness (KH) above 8 dKH provides a useful pH buffer. Many keepers add crushed coral to the filter or substrate to maintain hardness.
Maylandia tarakiki shares the intense intraspecific aggression typical of the zebra complex. A group should comprise one male and at least three to four females; a second male will be relentlessly persecuted unless the tank is large enough (typically 500+ litres) to hold two separate territories simultaneously, which is rarely practical. Mixed-sex juvenile groups can initially coexist, but as males colour up they must be thinned. The species should not be housed with other members of the zebra complex — Maylandia zebra, Maylandia estherae, Maylandia fainzilberi, and their relatives — because hybridisation occurs readily in captivity and the resulting offspring are genetically ambiguous; this matters both for conservation of pure lines and for the integrity of any future breeding project. Compatible tankmates are other mbuna of similar aggression and size from non-overlapping genera: Labidochromis caeruleus, Pseudotropheus saulosi, or Iodotropheus sprengerae are workable choices, though any combination should be monitored for dominance hierarchies. Avoid open-water cichlids (Aulonocara, Copadichromis) — their comparatively peaceful disposition makes them targets in a mbuna setup.
Diet in the aquarium should be predominantly spirulina-based flake or pellet to approximate the algae-rich aufwuchs diet. High-protein foods — beef heart, bloodworm, Tubifex — are a well-documented route to Malawi bloat in aufwuchs grazers; these should be avoided entirely or offered only occasionally and in small quantities. Occasional meals of frozen daphnia, Mysis shrimp, or quality spirulina-enriched brine shrimp round out the diet without imposing a heavy protein load. Feed small portions two to three times daily rather than one large meal.
Breeding follows the standard maternal mouthbrooder pattern. A conditioned female will spawn readily with the resident male; she then holds the eggs and fry in her buccal cavity for approximately 21–28 days at the upper end of the recommended temperature range. Experienced keepers typically strip the female at 14–16 days and tumble the eggs artificially, or allow the full hold and remove free-swimming fry to a separate grow-out tank to prevent predation. The female should be given a recovery period with good feeding before the next spawn, as repeated rapid cycling without adequate nutrition stresses the fish and shortens her productive life. Orange-blotch females are the morph most commonly seen in hobbyist stocks; both OB and normally barred offspring are produced from OB parents, and selective pressure in captivity has skewed many hobby lines heavily toward OB. Keepers with an interest in maintaining wild-type barred morphs should seek out breeders who have consciously preserved both colour forms.
Conservation
The IUCN Red List assessed Maylandia tarakiki (under the name Metriaclima tarakiki) as Least Concern in June 2018, assessed by Ad Konings and reviewed by Jos Snoeks. The justification is pragmatic: the species is described as one of the most common rock-dwelling cichlids at all three of its known localities, with a stable population trend. Although the total range is tiny — three sites, an area of occupancy under 6 mi² — no continuing decline or extreme fluctuation in population size, habitat quality, or range is considered likely at present. Potential threats flagged by the assessment are sedimentation from agricultural runoff (which clogs rocky substrates and breeding sites) and extraction for the ornamental trade, particularly targeting OB morphs; neither is currently regarded as causing population-level harm.
The broader context for Lake Malawi's cichlids is less comfortable. The lake supports approximately 850 species of cichlids, at least 90% of them endemic, but the rocky littoral zone that mbuna depend on is shrinking in quality. Deforestation in lake catchments, especially in Tanzania and Malawi, drives increased sediment loads into the lake, smothering the boulder surfaces that species like Maylandia tarakiki require for feeding and breeding. Studies reviewed by Bootsma and Hecky have documented rising nutrient and sediment loading linked to land-use change, and these pressures are expected to intensify with climate warming and continued population growth around the lake. For a species confined to roughly seven kilometres of shoreline — entirely within Tanzania — any deterioration of that specific stretch of habitat would be a direct threat. Fishing pressure is modest: the fish has no commercial value to subsistence fishers, and collection for the aquarium trade targets OB morphs at low but not negligible volumes. The species currently sits at the 'safe' end of the IUCN spectrum, but the narrowness of its range leaves little room for error if sedimentation or shoreline disturbance intensifies.